I know this is probably a silly question but what radiator brackets are these? I'm in the middle of a 5.3ls swap into a 1999 Mustang and I'm using a 4th gen fbody radiator and I'm pretty sure these brackets will work. I just can't figure out what vehicle they came off of. The picture is a LS swapped 1994 mustang using I believe an fbody radiator. Thank you all for looking. And yes I have

 

Those are stock brackets. They look identical to the ones from my Fox T-bird. That even looks like a stock radiator.

You can see it sort of on the passenger side of my radiator. (I'm using an aftermarket radiator though, obviously.)

 

I don't think they are stock foxbody brackets. Foxbody have a major bend in them to account for the lip on upper cross-frame. The brackets in my picture are a lot flatter. I actually have a set of stock foxbody brackets and they are no bueno.

These are what stock foxbody brackets look like:

 

Those are stock fox body brackets from a 5.0 car. The 2.3L cars have different brackets but also still work.

Actually the 2.3L brackets have a flange off the side which hangs over the top edge of an fbody cooling fan should you want to capture the fbody cooling fan.

See images in post #27 for pics of 2.3L radiator brackets.
https://ls1tech.com/forums/conversio...ers-etc-2.html


edit - sorry, somehow I missed your reply in post #2.

I see those are different based on the bend. A this point I don't know what they are from.

 

Actually I was sure I'd seen this before but I could not remember where from. Some random Google image searching:

I think they are from a Crown Vic. I did a quick google image search and got these:
http://www.w4wwj.org/Falcon-swap.htm
http://www.nicholsservices.com/vega/radiator.htm

and then this:

1986 87 88 89 90 91 FORD CROWN VICTORIA UPPER RADIATOR SUPPORT BRACKET

Ford # E6AZ-8A193-D

ebay item number 191032932724

http://www.ebay.com/itm/NOS-1986-87-...BSxE52&vxp=mtr

 

Holy sweet baby Jesus! Thank you man! I've been looking for those stupid things forever! I was going to use some off a 70's C-10 or just make some. I'll be hitting up the junk yard for them.